When you start from Class 9 then you get the chance to read few topic repeatedly from Class 9 to 12. If you can put extra effort to learn your basics more in details along with variety of questions solving then you can take extra lead during your Class 9 & 10 which actually allows you to give more time in solving numericals during Class 11 & 12. This way you can take the advantage of making early start.
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SIR , EK VIDEO CLASS 11 KI STARTING SE IIT MAINS AND ADVANCE KE LIYE BHI BANA DO